3.12 grams since you divde denisty by volume
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The mass is less than 1 kg.
None do. The mass of a CD is between 15 and 20 grams, meaning that 50 to 67 of them total 1,000 grams.
Well, honey, to find the mass of a single pin, you grab yourself a fancy little tool called a scale, plop that pin on there, and voilà, you got yourself the mass of that bad boy. Just make sure to zero out the scale first, unless you want to include the weight of your morning coffee in the measurement.
You cannot, there is no single-rule, formulaic relationship between mass and physical measurements like length or diameter.
I only know about the 'gram'. Is there another SI mass unit? If so, I submit it must be very elementary, perhaps a single free neutron.